From d67b1813ac563f79ed055a7e918c5f293a7069fc Mon Sep 17 00:00:00 2001 From: Michael Adam Date: Thu, 12 Apr 2012 17:52:43 +0200 Subject: [PATCH] s3:registry: wrap reg_deletevalue() in a transaction This is at the wrong layer, but if fixes a race potentially causing data corruption by concurrent access. (cherry picked from commit c1208c4a9c10b03579dca3bcd304709e631d3c25) --- source3/registry/reg_api.c | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) diff --git a/source3/registry/reg_api.c b/source3/registry/reg_api.c index 660a1a4839e..2eced2698b8 100644 --- a/source3/registry/reg_api.c +++ b/source3/registry/reg_api.c @@ -790,24 +790,50 @@ WERROR reg_deletevalue(struct registry_key *key, const char *name) return WERR_ACCESS_DENIED; } - err = fill_value_cache(key); + err = regdb_transaction_start(); if (!W_ERROR_IS_OK(err)) { + DEBUG(0, ("reg_deletevalue: Failed to start transaction: %s\n", + win_errstr(err))); return err; } + err = fill_value_cache(key); + if (!W_ERROR_IS_OK(err)) { + DEBUG(0, ("reg_deletevalue; Error filling value cache: %s\n", + win_errstr(err))); + goto done; + } + err = reg_value_exists(key, name); if (!W_ERROR_IS_OK(err)) { - return err; + goto done; } regval_ctr_delvalue(key->values, name); if (!store_reg_values(key->key, key->values)) { TALLOC_FREE(key->values); - return WERR_REG_IO_FAILURE; + err = WERR_REG_IO_FAILURE; + DEBUG(0, ("reg_deletevalue: store_reg_values failed\n")); + goto done; } - return WERR_OK; + err = WERR_OK; + +done: + if (W_ERROR_IS_OK(err)) { + err = regdb_transaction_commit(); + if (!W_ERROR_IS_OK(err)) { + DEBUG(0, ("reg_deletevalue: Error committing transaction: %s\n", win_errstr(err))); + } + } else { + WERROR err1 = regdb_transaction_cancel(); + if (!W_ERROR_IS_OK(err1)) { + DEBUG(0, ("reg_deletevalue: Error cancelling transaction: %s\n", win_errstr(err1))); + } + } + + return err; } WERROR reg_getkeysecurity(TALLOC_CTX *mem_ctx, struct registry_key *key, -- 2.34.1